The concept of something expanding into nothingness might seem counterintuitive or paradoxical, but it can be understood within the context of certain scientific theories and principles, such as the expansion of the universe.
According to the prevailing cosmological model, known as the Big Bang theory, the universe originated from an extremely hot and dense state about 13.8 billion years ago. At the moment of the Big Bang, all matter and energy were concentrated in an infinitesimally small and incredibly dense point called a singularity.
Following the Big Bang, the universe began to expand rapidly, and it continues to expand to this day. This expansion is not a movement of matter and energy into pre-existing empty space, but rather a stretching and expansion of space itself. It is important to note that the expansion of the universe is not an expansion "into" anything; rather, it is an expansion of the fabric of space itself.
To visualize this concept, imagine dots drawn on the surface of an inflating balloon. As the balloon is inflated, the distance between the dots increases, and this is analogous to the expansion of space. From the perspective of any dot on the balloon, it appears as if all other dots are moving away, even though there is no "center" or "edge" of the expansion.
In this framework, the concept of "nothingness" does not refer to the absence of space, but rather to the absence of matter and energy. The expansion of the universe involves the stretching of space, and as space expands, the distances between galaxies, clusters of galaxies, and other cosmic structures increase.
While the concept of the universe expanding into "nothingness" might be challenging to grasp intuitively, it is important to remember that it is a consequence of our current understanding of the nature of the universe based on observations and scientific models.